Tool for dressing emery-wheels



(No Model.) I

J. H. BENNETT.

TOOL FOR DRESSING EMERY WHEELS. No. 425,485. v Patented Apr. 15. 1890.

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UNITED STATES PATENT Fries.

JOHN H; BENNETT, OF XVORCESTER, MASSACHUSETTS.

TOOL FOR DRESSING EMERY-WHEELS.

SPECIFICATION forming part of Letters Patent No. 425,485, dated April 15, 1890. Application filed February 15, 1839, Serial No. 299,980, (No model.)

To a'ZZ whom it may concern:

Be it known that 1, JOHN II. BENNETT, a citizen of the United. States, and a resident of lVorcester, in the county of WVorcester and State of Massachusetts, have invented anew and useful Improvement in Tools for Dressing Emery-\Vheels, of which the following is a specification, accompanied by drawings, forming a part of the same, and in which- Figure 1 represents a side view of my improved tool for dressing emery-wheels, a portion of the handle having been removed. Fig. 2 is a top view of the sam e,- partly in sectional view. Fig. 3 is an end view, and also showing the supporting-rest, upon which the tool is held in the operation of dressing an emerywheel. Fig. i represents a central sectional view of the cutter upon a plane parallel with the'axis of the spindle, shown in its position 1 in the cutter, but detached from the frame. Fig. 5 is a sectional view of the cutter shown on line X X, Fig. 4:, showing one of the disks forming the cutter and the inclosed bushing interlocked with the disks. Fig. 6 is a sectional view of the cutter on the line so as, Fig. 4:, but showing a modified form of interlocking the disks and inclosed bushing. Fig. 7 is a view of one of the disks forming the cutter, constructed as-shown in Fig. 5. Fig. 8 represents one of the disks forming the cut ter and constructed as shown in the sectional view in Fig. 6. Fig. 9 represents one of the bushings detached from the cutter, and Fig. 10 is a sectional view of the bushing on line y a s- Similar letters refer to similar parts in the several figures.

The object of my invention is to provide a tool for dressing emery-wheels which have been worn by continued use, whereby the form and abrading quality of the grindingsurface is restored; and I accomplish this result by means of the device shown in the accompanying drawings, and hereinafter described and claimed.

A denotes the frame carrying the revolving cutter and provided with the handle B.

(J is a spindle held in the prongs a b of the frame A, and held from turning and also from 50 longitudinal. movemcnt in the frame by means of the screw 0, inserted in the prong a and having its point pressing against the spindle C.

Rotating upon the fixed spindle C, between the prongs a and h, is a cutter D, consisting of a series of steel disks (Z (Z (Z, separated by washers e c e and mounted ona tubular bushing f. The bushing f is provided with a slot g its entire length, and each of the disks d has a projecting spur h, which enters the slot g, thereby interlocking the disks and tubular bushing.

Outside the disks (Z- are placed the washers jj, which are slightly counterbored upon the outside to permit the expansion of the ends of the tubular bushing f.

In the construction of the cutter D the tubular bushing f is formed with its slot g, and the disks d and washers e are placed thereon with the spurs h of the disks entering the slot g. The ends of the tubular bushing f are then expanded to fill the opening in the washers j j and hold the disk and washers upon the bushing f.

The surfaces F F of the frame A form seats, which are placed upon the rest G, Fig. 3, by which the frame is supported while in the operation of cutting the surface of the emery-wheel, in the manner common with tools of this class.

The seats F F are provided with teeth k k k 70, which engage the corner on of the rest G and prevent the movement of the frame away from the emery wheel. For ordinary use, however, the frame is held level upon the rest G, as shown in the drawings, the friction of the teeth upon the surface of the rest being suflicient to prevent the movement of the frame away from the emery-wheel.

The rest G is held with its upper surface parallel with the axis of the emery-wheel, (indicated in Fig. 3 by the broken line H H,) and the surfaces F F of the frame are inclined to each other and to the axis of the spindle C, so that as the frame A is placed upon the rest G, with the seat F in contact with the rest, as shown in Fig. 3, the axis of the spindle and the axis of the rotating cutter D is brought at an angle with the axis of the emery-wheel. The plane of the cutting-disks cl (Z d are there fore inclined to the plane of the emery-wheel,

and as the cutter D is applied to the face of the emery-wheel, as shown in Fig. 2, in which the broken line J J represents the position of the emery-Wheel, the action of the cutter D upon the surface of the wheel will produce a partial scraping action, and the cutter D in drawn across the face of the emery-wheel, the

frame A is turned over, bringing the seat F upon the rest G and inclining the axis of the cutterD in the opposite direction, as indicated by the broken line K K, Fig. 3. The cutter canthen be applied to the face of the emerywheel at the opposite side or at J Fig. 2.

Referring to Fig. 3 of the drawings, it will be observed that the inclined surface forming the seat F extends entirely across the frame from side to side, so that the frame bears upon the rest G upon both sides of the rotating cutter, whereby the downward pressure or strain upon the frame when the cutter is applied to the emery-wheel will be received by the seat F upon both sides of the rotating cutter alike, causing the cutter to be permanently held in a state of inclination to the axis of the emerywheel without a torsional strain upon either the handle of the tool or the hand of the operator. Likewise the cutter will be held at an-opposite inclination by reversing the f ram e and resting it upon the seat F.

Tools for dressing emery-wheels have been made carrying a rotating cutter, which are capable of being inclined by rocking the frame supporting the cutter and maintaining the cutter in its inclined position by the strength of the operator. I am also aware that tools for the purpose have been shown in which inclined surfaces have been formed on the frame, by which the degree of inclination of the cutter has been indicated; but in such tools the inclination has been formed at different angles upon opposite sides of the cutter, forming surfaces which serve only to indicate that the cutter has been inclined the desired angle. Such a construction was shown and described in Letters Patent No. 397,503, granted to J. D. Huntington on the 12th day of February, 1889. Such I do not claim.

In the-construction of the cutter the disks cl cl can be interlocked with the tubular bushingf by means of a notch min the disks and turning the edge of the bushing f outward, entering thenotch, as shown in-Fig. 6, denoting the outwardly-turned edge of the bushs f- The spindle 0, upon which the rotating cutter revolves, is provided with a shoulder C, which bears against one of the outer washers j j ofthe cutter D, the holes through the prongs a and 19 being of different diameters to receive the spindle O, the portion of the face of the emery-wheel. be allowed to move entirely across the face spindle being larger at C and the spindle G is capable of sliding in the frame A, bringing the shoulder 0 toward or away from the cutter D, thereby allowing any lost' mot-ion resulting'from wear upon the sides of the cutter to be taken up by sliding the spindle C and bringing the shoulder C nearer the cutter, and securing the spindle in. position by means of the screw 0.

. The operation of my improved cutter is as follows: The rest G is adjusted at the proper. elevation and in a position parallel with the axis of the emery-wheel to be dressed, and the frame A is placed upon the rest in the position shown in Figs. 1 and 3, bringing the cutter D in contact with the face of the emery-wheel and upon the right-hand side of the wheel, as shown inFig. 2, causing a rapidrotation of the cutter D by means of its contact with the face of the revolving emery-wheel. As the frame A rests upon the rest G upon the seat F, the axis of the cutter is inclined,' forming an angle with the axis. of the emerywheel, as illustrated in Fig. 3, the broken line H H indicating the horizontal plane of the emery-wheel. The inclination of the axis of the cutter causes the cutter as it revolves upon the face of the emery-wheel to advance towardthe opposite side of the wheel or in the direction of the arrow 1, Fig. 2,which tendency to move across is partially resisted by the operator in holding the handle B, producing a scraping action of the edges of the disks upon the sur- The cutter D may of the emery-wheel, or it may be permitted to move only to the center of the face, and-the the axis of the spindle O in the opposite direczoo tion, and the cutter applied to the left side of the emery-wheel and the cutter advanced in the opposite direction from the left side J 2 to the center of the face.

The frame A can be held in a horizontal position upon the rest G, as shown in the drawings, and the cutter held from moving away from the emery-wheel by the friction of the teeth k is and by the hand of the operator, or the handle B can be raised and the frame A inclined, so that the teeth 70 shall engage the corner 1% of the rest G.

The seats F F are provided with a series of teeth in order to allow the cutter to be advanced toward the einerywheel without changing the position of the rest by chang-, ing the teeth engaging the corner of the rest.

WVhen the cutter is used with the frame A resting upon the rest in a horizontal position, as shown in the drawings, the handle can be moved in the arc of a circle'and in a'horizontal plane, carrying the cutter in a similar arc of smaller radius to conform to the curved face of a convex wheel, as indicated by the curved broken line L L, Fig. 2.

IIO.

I am aware that rotating cutters held in a V frame-work and applied to the grindingsurfaces of emery-wheels have long been in use. Such I do not claim, the essential feature of my invention consisting of a rotating cutter revolving about an axis which is inclined with reference to the axis of the emery-wheel. Neither do I claim, broadly,-the use ofa steel washer as a component part of the rotatin g cutter; but

'What I do claim, and desire 'to secure by Letters Patent, is 7 1. A tool for dressing emery-wheels, comprising a rotating cutter journaled in a supporting-frame an d a supporting-frame provided with an inclined surface, forming a seat upon which the frame rests when in use, said seat having a common plane of inclination extending upon both sides of said rotating cutter, whereby said cutter is maintained in a posision ofpermanent inclination to the axis of the emery-wheel to be dressed by .the downward pressure of the frame upon its seat, substantially as described.

2. The combination, in a tool for dressing emery-wheels, of a rotating cutter held in a supporting-frame and a supportingframe provided with surfaces on opposite side, forming seats, said seats beinginclined in opposite directions, each of said seats having a common plane of inclination extending upon both dle is held in position, as and for the purpose set forth. t

4. A tool for dressing emery-wheels, comprising a supporting-frame, a fixed spindle held in said frame, a sleeve or bushing turning on said spindle, and a series of disks keyed on said bushing by a groove formed in the one member and a projection in the other, whereby the independent rotation of the disks is prevented, substantially as described.

. JOHN H. BENNETT.

Witnesses:

RUFUS B. FOWLER, H. M. FOWLER. 

